The function execution is a statement, that calls function with given parameters.
General semantic of the function execution can be written as
where f is a function (see Functions)
and v is a vector of parameters passed to the function.
((x->y->(x y)) (x->2*x)) 3
In fact, v can be also any other object, which will be treated as a 1-element vector (see Vector of values).
When, in function execution statement f v,
expression f is not a function,
then it will be treated as a constant function, ie:
1("a") --> (x->1)("a") --> 1
Statement of the function execution is evaluated from right to left, that is:
f g h = f (g h) = f (g (h)) = f ((g) (h)) = (f) (g) (h)
Compiler requires that function execution statement must be written in one line.
This is because semicolons ending instructions are quite often forgotten.
And the forgotten semicolon could be understood as a statement of function execution of two instructions.